Question: In Exercises, use a graphing calculator to determine which expression (A)(F) on the right can be used to complete the identity. Then try to prove

In Exercises, use a graphing calculator to determine which expression (A)–(F) on the right can be used to complete the identity. Then try to prove that identity algebraically.

A.sin x sin x cos x COS X

B. cos x

C. tan x + cot x

D. cos3 x + sin3 x

E.

F. cos4 x - sin4 x

sin x sin x cos x COS X

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